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How to error code representation using enum in java

Here is the solution using your Enum that I typically employ to deal with error codes as you have explained in your scenario.

import java.util.HashMap;
import java.util.Map;
public class EnumSample {

public static enum LoginErrorCode {

EMAIL_OR_PASSWORD_INCORRECT("101"), EMAIL_INCORRECT("102"), UNKNOWN_ERROR_CODE("---");

private static Map<String, LoginErrorCode> codeToEnumMap;

private final String code;

LoginErrorCode(String code) {
this.code = code;
}

public String getCode() {
return code;
}

/**
* Looks up enum based on code. If code was not registered as enum, it returns UNKNOWN_ERROR_CODE
* @param code
* @return
*/
public static LoginErrorCode fromCode(String code) {
// Keep a hashmap of mapping between code and corresponding enum as a cache. We need to initialize it only once
if (codeToEnumMap == null) {
codeToEnumMap = new HashMap<String, EnumSample.LoginErrorCode>();
for (LoginErrorCode aEnum : LoginErrorCode.values()) {
codeToEnumMap.put(aEnum.getCode(), aEnum);
}
}

LoginErrorCode enumForGivenCode = codeToEnumMap.get(code);
if (enumForGivenCode == null) {
enumForGivenCode = UNKNOWN_ERROR_CODE;
}

return enumForGivenCode;
}
}

public static void main(String[] args) {

System.out.println( LoginErrorCode.fromCode("101")); //Prints EMAIL_OR_PASSWORD_INCORRECT
System.out.println( LoginErrorCode.fromCode("102")); //Prints EMAIL_INCORRECT
System.out.println( LoginErrorCode.fromCode("999")); //Prints UNKWNOWN_ERROR_CODE
}
}

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How to error code representation using enum in java

How to error code representation using enum in java